SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005453f58e41bf450579fac6b2f85d71d33666cb5bf36562ee57f2e13ff881d8' 
  AND token = '3LQ+g1M5ZO8JK4Bvac7/xEZVk+7vHmGZQomFbXjOYe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}